Hollow building block



C. KINDSTRUM.

Jain. 2, 1923.

HOLLOW BUILDING BLOCK FILED NOV 2 1920 Patented claim 2?, i923 tli lli l CARL KINDSTBQM, 0F STOCKHOLM, SWEDEN, .ASSIGNOR TO AKTIEBOLAGET LEAN, OF STOCKHOLTII, SWEDEN.

HOLLOXV BUILDING BLOCK.

Application filed November 2, 1920. Serial No. 421,397.

To all to 710m it may concern:

Be it known that I. CARL Krnns'rnoir, a sub ect oi the hing of Sweden, residing at Stockholm, Sweden, have invented certain new and useful Improvements in Hollow Building Blocks; and I do herebydeclare that the following is a full, clear, concise,"

and exact description of the invention, such as will enable others skilled, in the art to which it appertains to make and use the same.

This invention relates to improvements in building blocks, having for an object to provide an improved hollow building block provided with means upon its opposite ends adapted to interengage with the congruent ends of juxtaposed blocks whereby to effect a positive connection as between the same and likewise, to provide air spaces between the connection of the juxtaposed blocks.

In hollow building blocks hereto-fore prev- 4 alent, wherein a plurality of spaced partitions or lalnellte are connected by vertical transverse neck portions substantially near each end of the block, these neck portions being shaped so as to form air spaces between two blocks arranged together in endwise re lationship, the joint therebetween is coniparatively weak, particularly when the projecting portions of the neck of one block abut against the corresponding portions of the opposite hloclc Eliorts have been made with a view towards providing a more positive or tighter joint as by forming the end portions or engaging portions of said blocks with concavo-convex interfitting faces, but, as will be understood, blocks of suclrconstruction are irregular or unsymmetrical in shape and therefore, less practical in use. The present invention relates to means in term of? congruent-extensions upon the adjacent or abutting ends of building blocks for strengthening the point of jointurc their -hetween by forming the extensions or re cesses between the projecting portions of the extensions unequal in width, so that two projecting portions of one block will. enter the wider recess between the extensions of? the opposite block, and thus e'f'lect. positive en agenient; the vertical sides o'l said por tions being plane and inclined. at an angle to the axis of the block, or curved at the corresponding points forming the same angle to said axis, so that there will be formed broad contact surfaces between the respecworlrmen skilled in the art, I have in the ac companying illustrative drawings andinthe detailed following description based thereon, set out several possible embodiments of the same. I y

In these drawings 2 Figure 1 is a top view or two blocks .con structed in accordance with the invention and arranged in interengag'ed relationship;

Figure 2 is a similar view showing a slightly modified form of the improved blocks wherein their opposite extremities are formed to provide free air spaces therebetween when inter-engaged; and,

' Figure 3 is a top view of another modificationoi the invention when the same is applied to a corner block, two vertical air spaces being provided therebetween. I

'laving more particular reference to the drawings, in connection with which like characters or reference will designate correspondparts throughout, and referring inparsmear to the construction shown in Figure jections 7, 8 and 9 of equal length and in the same ln'nnber as the lainellee 1, 2 and 3.

The verticalfsides of these projections are inclined in relationto the lamelloe and by reason of this, provide recesses therein, which, as will be noted, are inclined in relation to the lamellae. These recesses, also, are in line with the corresponding air spaces in the blocks, but are of diiierent widths, so that one lateral projection, "for instance, the projection 7 is nearer to the central projection. 8 than the other projection 9. At the opposite ends of the blocks, the projections and recesses between them are arranged in a corresponding manner, but inversely, so that the wide recess in. one end of one of the blocks is aligned with the narrow recess in the other end thereof; Consequently when two blocks constructed in accordance with the invention are placed end to end, the two projections separated by the narrow recess in one block will enter the wider recess in the opposite block, and the inclined. faces of the projections of one block will come into overlapping engagement with the cori'espouding faces of the opposite block. By

reason of this engagement as between the projections on the adjacent ends of the blocks, air spaces will be provided between the same, each being formed by thewido recess in the end of one block and the narrow recess in the adjacent end of the opposite block; the centers of the air spaces between the two blocks thus being out of alignment.

in the Figure 2, I have showna slightly modified form of the invention, wherein when a pair of blocks constructed in accordance therewith is arranged in endwise relationship, three air spaces will be provided therebetween. In these particular blocks, the three air spaces are presented thereby due to the arrangement of the lamellae and the transverse vertical neck portions 5 and 6. The arrangement of the projections '1', 8 and 9 upon the ends of the blocks corresponds to the arrangement shown in connection with the Figure 1, that is. wide recesses being formed between cer tain of said projections alternating with narrow recesses bet-ween the other projections. Thus, in effect, by reason of the forming of the blocks with three air spaces, it will be understood that this embodiment corresponds with one block with two air spaces and a part of a second block with a single air space, as indicated by the dotted line A-l3 according to the construction shown in the Figure l.

in the Figure 3, I have shown the invention applied to a corner block, one end of which is constructed in accordance with that form of bloci" shown in the Figure 1, having the projections 7, 8 and 9 on that end adjacent the block in the next rectangular course, which latter, as will be noted, provided with projections upon one of the lOIlQ'liJUClllliil sides thereof and disposed so as to have overlapping engagement with the adjacent end of the previously mentioned juxtaposedblock. In this 1nodification, the'ends of the projections and the bottoms of the recesses are shown rounded or curved, which arrangement is preferable in view of facilitating the moulding of the blocks.

It to be understood that the blocks herein shown and described are given as exaniplcs only, since the characteristic features of the invention reside in the forming of blocks having recesses in their opposite ends ditli'eringin width and depth and of such shape, that two adjacent recesses and intermediate portions and intermediate portions of the neck at one end of the block are congruent to two adjacent recesses and intermediate portions in the other end of the block, and that the lateral faces of the recesses and intermediate portions at every corresponding point form an equal angle to the axis of the block.

I claim:

1. In ahollow building block having inclined vertical projections formed on its opposite ends, the projections on one of said ends providing recesses of different widths and depths and the projections on the opposite end of the block being inversely congrnent to the projections on the opposite end thereof.

2. In a hollow building block having inclined vertical project-ions formed on its opposite ends, said projections being formed to provide vertical recesses thcrebetween alternating in width and depth, and the pro jections on the re1naining"end of the l)l()('l( being inversely coi'igruent to said first project-ions, the side faces of the recesses formed between said projections forming an equal angle to the axis of the block at every correspoiuling point.

3. In a hollow building'block having the opposite ends thereof formed with vertical inclined projections, said project-ions upon the opposite ends of the block being of different widths and arranged. w l'iereby the wide recess between the projections 011 one end of the block is in alignment between the projections upon the opposite end of the block, as and for the purpose set forth.

In witness whereof I have hereunto set my hand. 1

CARL KINDSTROM. 

